/Engine/Plugins/Online/OnlineServices/Source/OnlineServicesCommon/Public/Online/SessionsCommon.h
Joins the session with the given session id, and assigns to it the given local name.
virtual [TOnlineAsyncOpHandle](API\Plugins\OnlineServicesInterface\Online\TOnlineAsyncOpHandle)< [FJoinSession](API\Plugins\OnlineServicesInterface\Online\FJoinSession) > JoinSession ( [FJoinSession::Params](API\Plugins\OnlineServicesInterface\Online\FJoinSession\Params) && Params )